Growth-induced perpendicular anisotropy of grains in Co-Al-O nanogranular ferromagnetic films

Timopheev, A. A.; Ryabchenko, S. M.; Каліта, В. М.; Lozenko, A. F.; Trotsenko, P. A.; Stognei, O. V.; Ситников, А. В.

doi:10.1134/s1063783411030309

Cited by 21 publications

(23 citation statements)

References 13 publications

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“…materials, it is possible to syn thesize nanocomposites with a granular structure, which exhibit practically important properties. Among them are the significant magnetoresistance effect caused by the surface oxidation of metallic par ticles (FeCoZr-Al 2 O 3 [6]) and the shape anisotropy of [3]), which allow the appli cation of these materials in the development of mag netic field sensors and media with ultrahigh informa tion recording density, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…The synthesis of samples plays an important role in the preparation of materials with the necessary structural and, consequently, physical parameters. The use of the ion beam sputtering method makes it possible to synthesize granular nanocomposites with various morphology of nanoparticles (granules with a metallic core-oxide shell structure [2], shape anisot ropy [3], etc.) owing to the conditions created during the synthesis (the high kinetic energy of deposited par ticles, the choice of the sputtering atmosphere and the concentration of chemically active gases in it, the simultaneous sputtering of metallic and dielectric components, etc.…”

Section: Introductionmentioning

confidence: 99%

“…In the previous works [2][3][4][5][6], it was shown that, using ion beam sputtering of metallic (FeCoZr, FeCoB, CoNbTa) and dielectric (Al 2 O 3 , SiO 2 , Pb(Zr,Ti)O 3 , etc.) materials, it is possible to syn thesize nanocomposites with a granular structure, which exhibit practically important properties.…”

Section: Introductionmentioning

confidence: 99%

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Influence of the short-range order in FeCoZr nanoparticles on the electrical and magnetotransport properties of FeCoZr-CaF2 nanocomposites

et al. 2012

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This paper reports on the results of the 57 Fe Mössbauer investigation of the short range order in FeCoZr nanoparticles and also the studies of the electrical and magnetotransport properties of (FeCoZr) x (CaF 2 ) 100 -x granular nanocomposite films in the concentration range x = 16-75 at %. A correla tion between the oxygen partial pressure during the synthesis of nanocomposites and the magnetic state of iron containing nanoparticles has been established. The influence of the oxidation of metallic particles on the electron transport mechanisms and on the magnetoresistance of the films has been analyzed. It has been found that, in the nanocomposites with a high FeCoZr concentration (x ~ 70-75 at %), there is a preferred orientation of the magnetic moments of α FeCo(Zr) nanoparticles in the direction perpendicular to the film plane.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of the short-range order in FeCoZr nanoparticles on the electrical and magnetotransport properties of FeCoZr-CaF2 nanocomposites

et al. 2012

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“…The Hs increased from 120 to 640 Oe with increasing dT-S, which indicates increase of perpendicular magnetic anisotropy given in appendix. The previous study has pointed out that both crystal anisotropy and shape anisotropy enhance a perpendicular magnetic anisotropy 19) . Thus, it is suggested that crystal anisotropy, which originated strong crystal orientation, attributed to large Hs for the film with dT-S = 80 mm.…”

Section: Experiments Experiments Experiments Experiments S S Smentioning

confidence: 99%

Effect of Perpendicular Magnetic Anisotropy on the High Frequency Soft Magnetic Properties of Co-Al-N Films

2012

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The high frequency soft magnetic properties (µ-f properties) of magnetically isotropic Co-Al-N films have been investigated. The Co-Al-N films with a Co content of around 80 at.% were prepared by the rf-sputtering method to change the distance between target and substrate (dT-S). The magnetization curves reveal that the films have a perpendicular magnetic anisotropy and are magnetically isotropic in the film plane. The saturation magnetic field (Hs) can be changed from 120 to 640 Oe as dT-S increases from 40 to 80 mm. The films show a stripe domain with a domain width of 400-500 nm, which decreases as increasing the perpendicular magnetic anisotropy increases. The films exhibit excellent µ-f properties, and their permeability keeps constant up to a few GHz and shows a clear peak at resonance frequency (fr), which shifts from 0.75 to 2.4 GHz correspond to the magnitude of their Hs.

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“…7,8 The major factor limiting the possibility of using these structures is the so-called superparamagnetic (SPM) limit that decreases the storage time of written information and requires the production of particles with a large anisotropy. 9 In such desired systems, high ferromagnetic (FM) content could sometimes lead to magnetic domains with anisotropy axis oriented normal to the film plane. 10,11 In previous reports, the systems containing perpendicular anisotropy have revealed some interesting results like the presence of complex magnetotransport 12 and domain like structures, 13 larger than the particle size.…”

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Perpendicular magnetic anisotropy and complex magnetotransport behavior of cobalt nanoparticles in silver matrix

Kumar

Chaudhary

Pandya

2015

Journal of Applied Physics

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Growth-induced perpendicular anisotropy of grains in Co-Al-O nanogranular ferromagnetic films

Cited by 21 publications

References 13 publications

Influence of the short-range order in FeCoZr nanoparticles on the electrical and magnetotransport properties of FeCoZr-CaF2 nanocomposites

Influence of the short-range order in FeCoZr nanoparticles on the electrical and magnetotransport properties of FeCoZr-CaF2 nanocomposites

Effect of Perpendicular Magnetic Anisotropy on the High Frequency Soft Magnetic Properties of Co-Al-N Films

Perpendicular magnetic anisotropy and complex magnetotransport behavior of cobalt nanoparticles in silver matrix

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